The most common Korean word for “notebook” is 공책 (gongchaek). There are 2 more words with a similar meaning — compare them below. 「notebook」는 한국어로 공책.
notebook
TOPIK 1 · noun
pocket notebook
TOPIK 1 · noun
notebook
TOPIK 2 · noun
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato